Add slf4j which is the dep of cronutils

[bowenlan-amzn]

Description

Job scheduler - depend on - cron-utils - depend on - slf4j

When we upgrade to OS 2.0, the dependency configuration compile is deprecated and implementation is used instead (code change), after this, the transitive dependency slf4j is not on the compileClassPath anymore so the relocation of slf4j is not working silently. This PR adds back the slf4j dependency so it can be relocated correctly again.

To check whether the slf4j gets relocated:

1. build job scheduler jar
2. check if slf4j is relocated in the jar jar tvf $file | grep -i "slf4j";

Issues Resolved

opensearch-project/index-management#519

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[codecov-commenter]

Codecov Report

Merging #256 (9bf9477) into main (197eb97) will decrease coverage by 0.22%.
The diff coverage is n/a.

❗ Current head 9bf9477 differs from pull request most recent head c700d8f. Consider uploading reports for the commit c700d8f to get more accurate results

@@             Coverage Diff              @@
##               main     #256      +/-   ##
============================================
- Coverage     53.19%   52.96%   -0.23%     
+ Complexity       65       64       -1     
============================================
  Files             8        8              
  Lines           438      438              
  Branches         50       50              
============================================
- Hits            233      232       -1     
  Misses          186      186              
- Partials         19       20       +1     

Impacted Files	Coverage Δ
...pensearch/jobscheduler/scheduler/JobScheduler.java	72.94% <0.00%> (-1.18%)	⬇️

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